Hi there I have a 2004 ford ka about 18 months ago it started misfiring quite badly took it to the garage who put on new spark plugs and ht leads this made no difference so took it to another garage who changed the coil pack. It ran smoothly for a while but after a couple of days the engine management light came back on as the car seemed to be running fine I left it only to find about six months later the sand thing happened it started misfiring so took it to yet another garage who said it was a cheap coil pack that had been put on and to put a proper ford part on so did this and it worked fine but eight months down the line it's misfiring again worse than ever. Anyone any ideas as to what might be causing this as surely shouldn't be going through two coil packs a year?